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一、教学目的1.通过整理和复习,使学生进一步掌握平行四边形、三角形、梯形面积公式的推导过程,能正确、灵活地运用公式进行有关计算以及解决一些简单的实际问题。2.通过操作、观察、比较,发展学生的空间观念,建立良好的知识结构,培养学生的创新意识。3.通过自主探究与合作学习,培养学生探究意识与合作精神。二、教学重难点整理完善知识结构,掌握多边形面积公式之间的联系。
First, the purpose of teaching 1. By finishing and review, to enable students to further grasp the process of derivation of parallelogram, triangle, trapezoidal area formula, the correct and flexible use of formulas for the calculation and solve some simple practical problems. 2. Through the operation, observation, comparison, and development of students ’space concept, establish a good knowledge structure, and cultivate students’ sense of innovation. 3. Through self-exploration and cooperative learning, students develop awareness and spirit of cooperation. Second, teaching heavy and difficult to organize and improve the knowledge structure, grasp the link between the polygon area formula.